Process of making arsenate of lead.



The latter proportion will result in orthoar- UNITE sra i as eiaranronnion.

E%LERSLIE E. LUTHER AND WILLIAM H. VOLGK, OF WATSONVILLE, CALIFORNIA.

PROCESS OF MAKING ARSENATE OF LEAD.

T 0 all whom it may concern:

' Be it known that we, ELLERSLIE E.

LUTHER and WILLIAM H. VoLoK, both citizens of the United States,residing at Watsonville, in the county of Santa Cruz and State ofCalifornia, have invented new and useful Improvements in Processes ofMaking Arsenate of Lead, of which the following is a specification. Ourinvention relates to an improved rocess for the preparation of arsenateof ead, and our process is carried out'as follows: A combining weight oflead oxid (PbO) commonly termed litharge, is reactedupon by a combiningweight of arsenic acid, the litharge being held in suspension in water,and the arsenic acid in solution, and the reaction is efl'ected after acatalyzing agent has been added. This catalyzing agent may be eithernitric acid or acetic acid. We have found that a preferable proportionis 1 to 3 pounds of the catalyzer to 100 pounds of the lead oXid. Theproduct is arsenate of lead, slight traces of lead salts ofthecatalyzer, and the catalyzer,

The combining weight of arsenic acid may vary from the proportion onepart of the anhydrid of arsenic acid to 1.938 parts of lead oXid, to aproportion of one part of the anhydrid of arsenic acid to 2.9 parts oflead oxid.

senate of lead, with traces of yroarsenate of lead, lead salts of thecata yzer, and the catalyzer. The first named pro ortion results inpyroarsenate of'lead, wit traces of 'orthoarsen a'te of lead, lead saltsof the catalyzer, and the catalyzer. Proportions vary- I Specificationof Letters Patent.

Application filed July 10, 1907.

Patented .iul 7, 1908.

Serial No. 382,994.

ing between the two will result in a mixture of the above namedarsenates'.

The reactions taking place when acetic 1 acid is used as a catalyze/r,are as follows:

The formation of lead acetate is the first rc action:

, PM) 2110,11 0, Pb (0 11 0,

The formation of basic lead acetate is the next reaction Pb((1,H,O PM)11.0 zrbon n o,

The formation of orthoarsenate of lead is the third reaction arbor-10 110 arraso,

ELLERSLIE E. LUTHER. WILLIAM H. VOLOK.

Witnesses:

L. F. BUOKHART,

A. T. PORTER.

